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Accelerated Carbonation of Binders Containing SCM at High CO2 Concentration
University of Borås, Borås, Sweden; RISE Research Institutes of Sweden, Infrastructure and Concrete Technology, Material Design, Brinellgatan 4, 50115 Borås, Sweden.
University of Borås, Borås, Sweden; RISE Research Institutes of Sweden, Infrastructure and Concrete Technology, Material Design, Brinellgatan 4, 50115 Borås, Sweden.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Schwenk Sverige AB, Hyllie Stationstorg 31, Malmö, Sweden.ORCID iD: 0000-0003-1904-7426
2023 (English)In: Nordic Concrete Research, ISSN 0800-6377, Vol. 69, no 2, p. 1-10, article id 1Article in journal (Refereed) Published
Abstract [en]

Accelerated carbonation of recycled concrete aggregates (RCA) could be an efficient way to reduce the carbon footprint. High CO2-concentration under optimal relative humidity could accelerate the CO2 binding capacity of the hydrated cement paste in the RCA. The latter is the topic of this paper. The study looks into the forced carbonation of crushed cement pastes as a basis to understand the CO2 uptake in relation to various binders containing supplementary cementitious materials (SCM) such as fly ash (FA) and ground granulated blast furnace slag (GGBS). Samples include three cement pastes: ordinary Portland cement, substitution rate of 30 % FA and 50 % GGBS respectively at a water/binder ratio of 0.45. All binders were graded to 0/2, 2/4 and 4/8 mm fraction sizes and preconditioned before exposed to CO2 concentration of 10 % under controlled temperature at 20 C-degrees and 65 % RH. All tested binders presented a high CO2 uptake within the first hours of exposure with clear differences concerning the fraction sizes and the composition. The phase content before and after carbonation was observed by X-ray diffraction and the portlandite and calcite were quantified by thermogravimetric analyses and their derivative curves for fraction size 4/8 mm.

Place, publisher, year, edition, pages
Nordic Concrete Federation , 2023. Vol. 69, no 2, p. 1-10, article id 1
Keywords [en]
Accelerated carbonation, SCM, TGA, XRD, Carbon sink
National Category
Materials Chemistry
Research subject
Building Materials
Identifiers
URN: urn:nbn:se:ltu:diva-103987DOI: 10.2478/ncr-2023-0004ISI: 001137272000004OAI: oai:DiVA.org:ltu-103987DiVA, id: diva2:1832322
Funder
Swedish Research Council Formas
Note

Validerad;2024;Nivå 1;2024-04-08 (hanlid);

Full text license: CC BY-NC-ND

Available from: 2024-01-29 Created: 2024-01-29 Last updated: 2024-04-16Bibliographically approved

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Mueller, Urs

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